Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Income
Common Stock, Beginning of period (in shares) at Dec. 31, 2013		41,842,000
Stockholders' Equity, Beginning of period at Dec. 31, 2013	$ 348,997	$ 41	$ (110,962)	$ 421,232	$ 38,515	$ 171
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2013			(6,837,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,518				30,518
Other comprehensive income (loss)	$ (1,532)					(1,532)
Stock repurchases (in shares)	(884,000)		(884,000)
Stock repurchases	$ (24,091)		$ (24,091)
Share-based compensation	12,785			12,785
Issuance of common stock under employee stock plans (in shares)		1,695,000
Issuance of common stock under employee stock plans	21,795	$ 2		21,793
Tax payments related to restricted stock units	(3,744)			(3,744)
Income tax benefits from employee stock plans	5,370			5,370
Common Stock, End of period (in shares) at Dec. 31, 2014		43,537,000
Stockholders' Equity, End of period at Dec. 31, 2014	390,098	$ 43	$ (135,053)	457,436	69,033	(1,361)
Treasury Stock, End of period (in shares) at Dec. 31, 2014			(7,721,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,760				30,760
Other comprehensive income (loss)	$ (1,369)					(1,369)
Stock repurchases (in shares)	(1,424,000)		(1,424,000)
Stock repurchases	$ (50,021)		$ (50,021)
Share-based compensation	14,921			14,921
Issuance of common stock under employee stock plans (in shares)		1,202,000
Issuance of common stock under employee stock plans	17,091	$ 2		17,089
Tax payments related to restricted stock units	(3,627)			(3,627)
Income tax benefits from employee stock plans	4,535			4,535
Common Stock, End of period (in shares) at Dec. 31, 2015		44,739,000
Stockholders' Equity, End of period at Dec. 31, 2015	$ 402,388	$ 45	$ (185,074)	490,354	99,793	(2,730)
Treasury Stock, End of period (in shares) at Dec. 31, 2015	(9,145,000)		(9,145,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 603				603
Other comprehensive income (loss)	$ (6,789)					(6,789)
Stock repurchases (in shares)	0
Share-based compensation	$ 19,500			19,500
Issuance of common stock under employee stock plans (in shares)		1,039,000
Issuance of common stock under employee stock plans	17,692	$ 1		17,691
Tax payments related to restricted stock units	(3,490)			(3,490)
Income tax benefits from employee stock plans	1,703			1,703
Common Stock, End of period (in shares) at Dec. 31, 2016		45,778,000
Stockholders' Equity, End of period at Dec. 31, 2016	$ 431,607	$ 46	$ (185,074)	$ 525,758	$ 100,396	$ (9,519)
Treasury Stock, End of period (in shares) at Dec. 31, 2016	(9,145,000)		(9,145,000)